CYMATOSIRA. 



327 



GENUS 45. CYMATOSIRA GRUNOW, 1862. 



Valve lanceolate, with coarse puncta, Gir- 

 dle face rectangular, undulated. Frustules in 

 filaments. 



a, b. 



Fig. 80. 

 Cymatosira Lorenziana. 

 a. Valve view. b. Girdle view. 



C. Belgica Grun. ! (H.v.H. Atl., pi. 45 , f. 38-41*), plate n, 

 fig 456. 



Valve lanceolate, very slightly attenuate up to the apices, which are sub- 

 acute, with coarse puncta, sparse, but generally leaving a pseudo-raphe of 

 greater or less breadth. Frustules rectangular, in short filaments, with girdle 

 face constricted near the apices. Length, 1*5 to 3 c.d.m. 



Marine. Rare : Blankenberghe. 



GENUS 46.-CAMPYLOSIRA GRUNOW, 1882. 



a. b. 



Fig. 81. 

 Campylosira cytnbelliformis. 

 a. Valve view. b. Girdle view. 



Valve cymbelliform, with rostrate apices, 

 dorsal margin arcuate, ventral margin gently 

 concave, covered with sparse puncta, without 

 visible pseudo-raphe. Girdle face arcuate, 

 constricted near the apices. Frustules united 

 in filaments. 



C. cymbelliformis (A. Schmidt) Grun. ! (Synedra anus 



j3 minor Grun. olinu ; H.V.H. Atl., pi. 45, f. 43*; Type No. 320), plate n, 

 fig- 457- 



A single species, with characteristics of genus. Mean length, 4 c.d.m. 



Marine. Very common on all our coasts. 



